US2539211A

US2539211A - Rotary disk brush

Info

Publication number: US2539211A
Application number: US76069A
Authority: US
Inventors: Jr Courtland N Smith
Original assignee: Regina Corp
Current assignee: Regina Corp
Priority date: 1949-02-12
Filing date: 1949-02-12
Publication date: 1951-01-23
Anticipated expiration: 1968-01-23

Description

Jan. 23, I951 c. N. SMITH, JR 2539,211

ROTARY DISK BRUSH Filed Feb. 12, 1949 -3 x l) \KSII/ /9 2 INVENTOR.

2 Couri/ana N Smff/gJr ATTORNEYS Patented Jan. 23, 1951 UNITED "S TATES PATENT OFF ICE 7 ROTARY DISK'BRUSH 1Courtland.N. Smith, Jr., Glen Ridge, N.-J., sas- Signor to .The Begina Corporation, 'Rahway,

N.-J., a corporation of New York Application February '12, 1949, Serial N0."7.6;l69

The :invention "relates to rotary brushes .for sweeping: scouring, iandgpolishing floors and like surfaces.

Thegeneral "object of the invention is to provide a new, simple, inexpensive and practical rotary brush .which may be operated with a minimum of vibration and-noise, which embodies an improved distribution :of bristle tufts, and which is of light weight and highlyresistant to Water, detergents, :and other common cleaning agents.

.A special object -,is to provide :a rotary brush of the class described, the 'base, or bristle-holding back, of which .is :a single casting, preferably made of injection molded .ethyl cellulose or of another plastic which is .of relatively-light weight, highly impervious "to water and detergents, and of v.poor sound conductivity, and having formed therein on one face a novel distribution of bristle sockets adapted to hold .a plurality of tufts zthe ends-of which'are more uniformly distributed'over ananmilanbrushing surface. Poor sound conductivity-isdesirable for the purpose of minimizing operational noise upon incidental contact of the base and ,a floor, baseboard, or other object. Imperviousnessto water and detergentsis a manifest advantagaaas it is well known in the artthat wooden bases i0! rotary brushes of this class are highly subject tozslightzchanges of size and shape due to absorption ofcleaning agents and variations of moisture content and in consequence often become permanently Warped and operate with increased vibration and noise.

A further object of the invention is =to; provide a brush-of the classdescribed the base of which is provided with bristle :sockets arranged as :a pluralityaof circularseriesihaving acommon center, those sockets in series nearer said :center being of circular cross-section .and having axes normalto the plate of the baseiandthosesockets in series fartherfrom saidcenter being'of rectangular cross-section and having the :shape of truncated wedges so :that .tufts f :bristles held within said: last named sockets, and :conseguently near the periphery of the brush, are so close together as :to :provide what is substantially san annular Ltuft of evenibristle incidence, .with ithose bristles nearest "the-:center .of the brush being more :nearly .normal :to the plane .of the base and those .i'bristles ifarthest therefrom libeing 1 less normal to said:planelandsextending:centrifugally.

.In 1 the drawing:

. Fig. 1v is aside :-view;.zFig. :2 is.;a1itop .view, and Fig. .3 is a :bottom viewgof :thebrushcof tithe pres-- ent: inventiomieach figure being "incomplete awith =8 Claims. (01.15-480) respect to the bristles. Only a few bristlesare shown in each figure; but the .:general shape of the tuft arrangementisindicated by dotted lines; andy-in Fig. :3, two zormore tufts of bristles .are shown in each concentric series of bristle socketsin lone generaLangular-area so thatthe structure of the complete brushing surface and the advantages of athelnovel form of socket arrangement may-be 'fullyunderstood. In Fig. ,3, only a portion of the bristlesockets are shown, but the distribution pattern "of the .entire base is .a repetition of *the series illustrated.

Fig. 4 is .a fragmentary-sectional view of the base of the brush in {accordance with the index 44'of.-Fi g.i 3. Here no bristles are shown.

.The base, or bristle-holdingback, of the brush is designatediniitszentirety l0. Thismemberis a discoid Ehaving -a;p1ane lower surface II with a countersinktherein at 1-2 which is. of circular shape-.andwconcentric with :the base, and having a3central perforationat =l3 to accommodate .a hub :adapted .to :accommodate :a shaft '(not shown) llfOI' rotatingitheibrush. Therbase ibis provided with 'a hub 14 (preferably metallic) which .is :castellate'd at 1 5, 15, ,15, .15., to provide keyways for :a .suitable :member :mounted upon said :shaft :to engage and impart rotary motion tozthe-brush. The bore I16 of .thezhub ldxisiexpanded at 16a .to :facilitate the entry of .a shaft into :said bore.

The underside :of the .base 10 provided with .a aplurality-:her.e, :inlFig. 3, with four-of circularly disposedand concentric series of bristle sockets, the innermost and 'THBXtXSBI'iGS being of sockets *of =circular cross-section and axially normalflto the'plane'ofthebase (i. ,e., to the sur- .face 1.!) pandthe outermostand next series be ing of sockets of rectangular crossesection and shaped like truncated wedgeszmore particularly described below. See.Figs..-;3 and 4. Any sock- .et of lithe innermostrseries isindexed #8; any socket of its adjacent series, l 9. :Sockets [8 and 11:9:may rbe of the: same .-shape and size, and .are preferably :of simple cylindrical form, although .a slight taper :so as to expand the sockets at their; mouths may be 1 introduced for the purpose of facilitating separation of dies :in injection molding'operation; :here, .in .--Fig. 3, sockets -IB .and I9 are showntobe .arrangedin sta ered angular relationship .;to;;each other. .-Any socket of vthe outermost-"series :is indexed .320; any socket :of;.itszadjacentz seriesgll .Sockets z I33 and :i-9 2 are alliof theishapebfvtruncated wedges; ;,but sockets .zflcarerpreferably larger than sockets 2| ,to compensate ifor :the greater centriiugal "distance of the former with respect to the latter and to insure a more uniform incidence of bristles over the peripheral brushing surface.

That surface of any socket 20 or 2! nearest to the center of the brush is designated 22 and is substantiall normal to the surface H, or gen eral bottom of the base ii). That surface of any socket 23 or 2| farthest from the center of the brush is designated 23 and is inclined with respect to the surface i 5 so that the mouth of any socket 26 or 2i is larger than the bottom thereof.

The sockets 2G and 25, each kind in its series, are separated by narrow septa so that the bristles may be as close together as desired throughout the peripheral series of tufts as a whole. Those septa between sockets to within the related series are designated 2d, and those between the sockets 2i are designated 25. See Fig. 3.

The purpose of forming the sockets of the peripheral series substantially in the shape of truncated wedges is of course obvious (and is clearly illustrated in Fig 3): provision is made for mounting bristle tufts so as to form a practically uniform annularbrushing means. Areas of the brushing surface near the periphery of the brush having a considerably reduced incidence of bristle ends are thereby avoided. An approximation of rectangular cross-section for the sockets of the outer series is sufficient for practical purposes. It will be evident that the outer bristle sockets may be of truly rectangular crosssection and the separating septa of rhomboid crosssection; that the outer sockets may be of rhomboid cross-section and the septa of rectangular section; and that the radial surfaces of the sockets normal to surface H of the base may be planes and the near and distant sides of the sockets with respect to the center of the brush, may be cylindrical. The gist of the pat-. tern of the peripheral series is that of a closely positioned assembly of sockets of truncatedwedge-shape having substantially quadrilateral cross-section greater at the mouth than at the bottom, it being immaterial for the purposes of the present invention that the centripetal and centrifugal sides of the sockets are planar or cylindrical to accord with the discoid formation of the base it, so that each tuft of bristles may be mounted, and also may be formed by the socket in which it is received, so as to have a roughly quadrilateral cross-section to the end that adjacent tufts are so close together as to present the appearance of a single annular tuft of uniform bristle incidence.

Fig. 3 shows, mounted on two

shoulders

26 and 21 provided within the countersink at l2 within the base it! and secured by means of two cap screws 28 and 29 a bearing structure 3| aligned with the perforation at l3. This structure, usual in the art, provides means for aligning a ferrule or the like on the bottom of a shaft provided for rotating the brush.

In Fig. 3, tufts of bristles are shown mounted in several of the sockets of the base if). The bristles, generally are indexed 32 in Figs. 1 and 2, wherein only a few are shown. These few shown in these figures and in Fig. 3, together with the dotted margin lines of the three figures, clearly indicate the general disposition of the bristles in the aggregate with respect to the base 10. In Fig. 3, two

tufts

33, 33 are shown mounted in adjacent sockets l8, l8 (obscured) of the innermost series of sockets; adjacent thereto two other tufts 34, 34 are shown mounted in adjacent sockets l9. l9 (obscured) of the next series; adjacent to these last mentioned tufts three other tufts 35, 35, 35 are shown mounted in consecutive sockets 2|, 2|, 2| (obscured) of the next but outermost series; and adjacent to tufts 35 two further tufts 3B, 36 are shown mounted in adjacent sockets 20, 2f) (obscured) of the outermost series. The nine tufts shown occupy a more or less common angularposition with respect to the base It) for the purpose of illustrating thereby the general pattern of the bristle ends at the brushing surface of the device.

It will be noted that

tufts

33, 33 and 34, 34 are of the ordinary roughly circular cross-section type and are set in staggered formation in the common manner. This arrangement of tufts is satisfactory for the inner part of the brushing surface. However, near the periphery it is desirable that the high incidence of bristle ends be preserved and for this reason sockets and tufts of roughly quadrilateral cross-section are provided, and Fig. 3 shows how the incidence of bristle ends is thereby maintained in substantial uniformity over the entire annular brushing surface. This arrangement of bristle ends provides a brush having a greater sweeping, brushing and polishing efficiency than that of a brush whose bristles are arranged so as to have a decreasing incidence of ends in accordance with the radial distance from the brush center.

It will be understood that in making the base it) by molding the same, one operation suffices to form the entire brush back with the sockets for the bristles complete in such operation, and avoids the turning and drilling operations necessary in preparing wooden brush backs. Also in a molded base of the kind described the edges of the bristle sockets are not sharp and interfere less with the operation of inserting the various tufts. In the base H), it will be understood that a simple two-part die may be employed in injectioir-molding the same as the configuration of the sockets and other parts of the base are such that a simple two-part die may be separated by movement along a common axis (note that a socket 213, for example, in Fig. 4, which is generally like a socket 2|, is shaped so that the male portion of a die part employed to form the socket may be withdrawn along a direction parallel to the axis of the base itself).

I claim:

1. A rotary brush having a brushing surface substantially normal to the axis of rotation of said brush, comprising a discoid base, having a plurality of concentric series of sockets therein, bristles secured within said sockets, said bristles forming a substantially planar brushing surface, one series of sockets, near the periphery of said base, being substantially quadrilateral in crosssection in a plane parallel to said brushing surface, and a second series of sockets adjacent to said first-mentioned series, also substantially quadrilateral in cross-section in a plane parallel to said brushing surface, and staggered angularly relative to said first-mentioned series.

2. A rotary brush having a brushing surface substantially normal to the axis of rotation of said brush comprisin a discoid base, said base being composed of a moldable material and having a plurality of concentric series of sockets therein, bristles secured within said sockets, said bristles forming a substantially planar brushing surface, one series of sockets near the periphery of said base, being substantially quadrilateral in cross-section in a plane parallel to said brushing surface, and a second series of sockets adjacent to said first-mentioned series, also substantially quadrilateral in cross-section in a plane parallel to said brushing surface, and separated from said first-mentioned series only by a thin wall of said moldable material.

3. A rotary brush having a brushing surface substantially normal to the axis of rotation of said brush comprising a discoid base, having a plurality of sockets therein, a series of said sockets near the peripheral edge of said base being arranged in a circle about the axis of rotation, a second series of said sockets being arranged 'in a smaller circle adjacent to and concentric with said first-mentioned series, the first-mentioned series of sockets having the edges at the mouths thereof which are adjacent to said second-mentioned series of sockets forming substantially straight lines and said second-mentioned series of sockets havin the edges at the mouths thereof which are adjacent to said first-mentioned series of sockets forming substantially straight lines, and said last-mentioned edges being substantially parallel to said first-mentioned edges.

4. A rotary brush as claimed in claim 1 wherein said series of sockets of substantially quadrilateral cross-section are the series nearest the outer periphery of said base.

5. A rotary brush having a brushing surface substantially normal to the axis of rotation of said brush comprising a base having a plurality of sockets therein, bristles secured within said sockets, said bristles forming a substantially planar brushing surface, a series of said sockets near the peripheral edge of said base positioned in a circle, the edges at the mouths of said series of sockets forming substantially straight lines and adjacent edges of adjacent sockets of said series being substantially parallel, a second series of sockets adjacent to said first-mentioned series of sockets and positioned in a circle smaller than and concentric with said first-mentioned series of sockets, the edges of said second-mentioned series of sockets at the mouths of said second-mentioned series of sockets forming substantially straight lines, said first-mentioned series of sockets having those edges of said first-mentioned edges which are furthest from the outer peripheral edge of said brush substantially parallel to the adjacent edges of said second-mentioned series of sockets.

6. A cylindrical rotary brush as claimed in claim 5 wherein said second-mentioned series of sockets are staggered angularly relative to said first-mentioned series of sockets.

7. A rotary brush having a brushing surface substantially normal to the axis of rotation of said brush, comprising a discoid base having a plurality of sockets therein, bristles secured within said sockets, said bristles forming a substantially planar brushing surface, the sockets nearest the outer peripheral edge of said brush being substantially quadrilateral in cross-section in a plane parallel to said brushing surface and said last-mentioned sockets having the side walls nearest the outer peripheral edge of said brush disposed so that the edges of said side walls at the mouths of the said last-mentioned sockets are nearer the outer peripheral edge of said brush than the edges of said side walls at the bases of said last-mentioned sockets, and said last-mentioned sockets having the walls furthest from the peripheral edge of the brush disposed so that the edges of said last-mentioned walls at the mouth of said last-mentioned sockets are substantially the same distance from the outer peripheral edge of said brush as the edges of said last-mentioned walls at the base of said last-mentioned sockets.

8. A rotary brush as claimed in claim 7 in which the sockets adjacent to said sockets near est the outer peripheral edge of said brush are shaped similarly to said sockets nearest the outer peripheral edge of said brush.

COURTLAND N. SMITH, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,009,335 Olson Nov. 21, 1911 1,452,307 Martin Apr. 17, 1923 1,792,363 Dehufi Feb. 10, 1931 1,950,379 Angell Mar. 13, 1934 2,156,514 Sassano May 2, 1939 2,295,687 Ponselle Sept. 15, 1942 2,306,389 Jorgensen Dec. 29, 1942 2,355,744 Myers Aug. 15, 1944 2,397,471 Cox Apr. 2, 1946 2,398,570 Wildhaber Apr. 16, 1946